Search for new thermoelectric materials through exploratory solid state chemistry

Antje Mrotzek, Tim Hogan, Mercouri G. Kanatzidis

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

The compound types A1+xM3-2xBi7+xSe14, A1-xM3-xBi11+xSe20, A1-xM4-xBi11+xSe21 and A1-xM5-xBi11+xSe22 (A = K, Rb, Cs; M = Sn, Pb) form from reactions involving A2Se, Bi2Se3,M and Se. The single crystal structures reveal that they are all structurally related so that they all belong to the homologous series Am[M6Se8]m[M5+nSe9+n ] (M = di- and trivalent metal), whose characteristics are three-dimensional anionic frameworks with tunnels filled with alkali ions. The building units that make up these structures are derived from different sections of the NaCl lattice. In these structures, the Bi and Sn (Pb) atoms are extensively disordered over the metal sites of the chalcogenide network, giving rise to very low thermal conductivity. These phases are all narrow gap semiconductors with 0.25 < Eg < 0.60 eV and many possess physico-chemical and charge transport properties suitable for thermoelectric investigations.

Original languageEnglish
Pages (from-to)101-112
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
Volume691
Publication statusPublished - Jan 1 2002
EventThermoelectric Materials 2001-Research and Applications - Boston, MA, United States
Duration: Nov 26 2001Nov 29 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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